Sony details its new Concept for Android UI: near stock Lollipop with popular Sony apps

According to Sony, the "Concept for Android" UI is based on Android 5.1 Lollipop, and offers a "stripped back, vanilla Android look and feel" that's enhanced with some of the most popular Sony features and apps.
Only 500 Xperia Z3 users in Sweden will be able to test Sony's new Android UI (by registering at the second source link below). However, Sony says that this first trial may lead to trials for other Xperia devices, in more countries.
Do you own an Xperia smartphone or tablet? If yes, what do you think about Sony's initiative to strip down its Android user interface?
sources: Sony, Sony Concept for Android UI registration